A benzo[1,2-b:4,5-b鈥瞉dithiophene-based copolymer with deep HOMO level for efficient polymer solar cells

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• 作者：Shanpeng Wen ; Qingfeng Dong ; Weidong Cheng ; Pengfei Li ; Bin Xu ; Wenjing Tianp> ; p>p>wjtian@jlu.edu.cnp>
• 关键词：Conjugated polymer ; Polymerization ; Photovoltaic devices
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 期刊代码：81_09270248
• 类别：ce
• 出版时间：May, 2012
• 卷：100
• 期：Complete
• 页码：239-245
• 文件大小：850 K

摘要

A new D-A conjugated polymer containing a benzo[1,2-b:4,5-b鈥瞉dithiophene donor unit and bisthienyl-s-tetrazine acceptor unit, PBDT-TTz, was synthesized by Stille cross-coupling polymerization and was characterized by p>1p>H NMR, elemental analysis and GPC. The copolymer shows good thermal stability with decomposition temperature of 276 掳C and broad absorption band from 350 to 700 nm. Cyclic voltammetric measurement shows that the HOMO energy level of the copolymer is deep-lying (鈭?.42 eV), which implies that the copolymer has good stability in the air and assures a higher open circuit potential when it is applied in photovoltaic cells. Bulk-heterojunction polymer solar cells were fabricated using PBDT-TTz blended PC₇₁BM as the active layer. The power conversion efficiency of the PSC is 3.32%under 100 mW/cmp>2p> AM 1.5 illumination, indicating that PBDT-TTz is a potential candidate for polymer solar cells.